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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(µg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) eet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW4 11/18/98 7 18 1640 -922 000 <0 5 14 54 <0 5 770 c 15 MW4 03/30/99 718 -- -- -- -- -- -- -- -- -- MW4 05/05/99 7 18 1490 -772 000 <0 5 <0 5 114 <0 5 542 72 MW4 08/20/99 718 1645 -927 000 140 151 <0 5 168 460 203 MW4 12/06/99 718 1655 -937 000 <1 <1 18 47 330 89 MW4 02/29/00 718 1412 -694 000 43 <1 <1 <1 100 7 MW4 05/16/00 7 18 1414 -696 000 19 <1 <1 <1 190 69 MW4 09/11/00 7 18 1649 -931 000 <0 5 <0 5 <0 5 <0 5 330 72 MW4 12/13/00 7 18 1635 -9 17 000 <0 5 5 8 082 5 1 360 13 MW4 12/13/00 718 t0* MW4 03/08/01 7 18 1549 -831 000 <0 5 <0 5 <0 5 <0 5 280 24 MW4 06/21/01 7 18 1682 -964 000 <0 5 <0 5 <0 5 <0 5 200 30 MW4 06/21/01 7 18 32* MW4 09/20/01 7 18 1796 -1078 000 <0 5 076 <0 5 191 270 36 MW4 09/20/01 7 18 40* MW4 12/04/0I 712 1771 -1059 000 076 <0 5 <0 5 <0 5 69 74* MW4 03/05/02 712 1685 -973 000 320 <0 5 <0 5 <0 5 316 h 760 MW4 03/05/02 712 112* MW4 06/11/02 7 12 1741 -1029 000 29 <0 5 <0 5 <0 5 424 h 778 MW4 06111/02 712 40 6* MW4 09110102 712 1853 -1141 000 24 <05 <05 <05 324 h 850 MW4 09/10/02 712 94 4* MW4 12/18/02 712 1828 -11 16 000 18 <0 5 <0 5 <0 5 301 h 826 MW4 12/18/02 712 92 0* MW4 03/24/03 7 12 1780 -1068 000 <0 5 <0 5 <0 5 <0 5 402 h 723 MW4 03/24/03 7 12 72 5* MW4 06/11/03 712 1793 -1081 000 230 06 <0 5 <0 5 372 h 686 MW4 06/11/03 712 62 6* MW4 09/17/03 712 1927 -12 15 000 330 <0 5 <0 5 <0 5 547 h 108 MW4 09/17/03 712 114* MW4 12/08/03 7 12 1928 -1216 000 170 <0 5 <0 5 <0 5 444 h 126 MW4 12/08/03 712 130* MW4 03/02/04 7 12 1778 -1066 000 220 <0 5 <0 5 <0 5 354 h 100 g 1projects1739421masterlwp1g100513942gw xis Page I I of 58